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On standby to be waiting for a seat/ticket to become available on a train/plane/bus(´ë±âÇϰí ÀÖ´Â): The emergency services were put on standby after a bomb warning.
On target to be on schedule, to be exactly as predicted(Á¤È®ÇÑ; (¡¦¿¡) ÀûÁßÇÑ, ¿¹»ó´ë·ÎÀÇ): Although not always on target, the Professor's predictions are more accurate than most.
On tenterhooks is waiting impatiently and excitedly for something(Á¶¹Ù½ÉÇÏ´Ù, ¾È´ÞÇÏ´Ù): I've been on tenterhooks all week waiting for the results.
On the air being broadcast on radio or TV(¹æ¼ÛÁß¿¡; (ÇÁ·Î°¡) °è¼ÓµÇ´Â): That television program has been on the air for three years now.
On the alert to be watchful and attentive for someone/something(°æ°èÇÏ´Â, Á¤½ÅÂ÷¸®°í ÀÖ´Â): As the general elections approach, politicians are on the alert for any changes in public opinion.